Costlens shows what each client's tools truly cost you, surfaces subscriptions still billing for clients who've left, and turns the rebillable ones into an invoice line — so no margin quietly walks out the door.
Try the free margin-per-client calculator · no card required.
Agencies buy dozens of tools across dozens of clients. The tracking spreadsheet is stale within a week — and that's exactly where the margin leaks.
Without cost mapped to each client, you can't see which account the software bill is actually eating — so the worst retainer looks like all the others.
A client leaves, but their seats and tools renew on autopilot. Nobody remembers every one. You quietly absorb the cost.
Much of what you buy is meant to pass through to the client. Which ones actually made it onto an invoice is a monthly guess.
Built for a studio, not an enterprise — no annual contract, no sales call, no bank login to get started.
Import from a spreadsheet or sync your accounting. Costlens builds the full picture of what you're paying for.
Assign tools to the clients they serve. Cost and margin per client appear instantly — and churned-client waste gets flagged.
Turn pass-through costs into a clean invoice line and send it to your billing. Nothing slips through unbilled again.
Reserve your plan to claim a founding spot. Founding members lock in 50% off for the life of the account — nothing is charged today.
Founding price is locked for the life of your account. Cancel anytime.
The free calculator is live above — use it anytime. Add your email to get early access to Costlens, help shape what gets built, and lock in the founding price.
Straight with you: Costlens is early. I'm Johnny — I keep hearing this problem from agencies and I'm building the tool for it in the open. Sign up and you help shape what gets built, and lock the founding price.
I'll email you personally in the next day or two to set up a quick 15-minute chat. In the meantime, the free calculator is yours to use.
— Johnny, Costlens